SU14813: a Novel Multiple Receptor Tyrosine Kinase Inhibitor with Potent Antiangiogenic and Antitumor Activity
1774 SU14813: a novel multiple receptor tyrosine kinase inhibitor with potent antiangiogenic and antitumor activity Shem Patyna,1 A.Douglas Laird, 3 Dirk B.Mendel, 5 KIT, and FLT3. In cellular assays, SU14813inhibited ligand- Anne-Marie O’Farrell,2 Chris Liang,6 dependent and ligand-independent proliferation, migration, Huiping Guan,8 Tomas Vojkovsky,6 Stefan Vasile,7 and survival of endothelial cells and/or tumor cells express- B Xueyan Wang,9 Jeffrey Chen,1 Maren Grazzini,1 ing these targets. SU14813inhibited VEGFR-2, PDGFR- , Cheng Y.Yang, 10 Joshua O˝.Haznedar, 5 and FLT3phosphorylation in xenograft tumors in a dose- 4 1 and time-dependent fashion. The plasma concentration Juthamas Sukbuntherng, Wei-Zhu Zhong, in vivo 2 1 required for target inhibition was estimated to be Julie M.Cherrington, and Dana Hu-Lowe 100 to 200 ng/mL. Used as monotherapy, SU14813 1Pfizer Global Research and Development; 2Phenomix Corp., exhibited broad and potent antitumor activity resulting in San Diego, California; 3Exelixis, Inc.; 4Celera Genomics, Inc., regression, growth arrest, or substantially reduced South San Francisco, California; 5Chiron Corp., Emeryville, growth of various established xenografts derived from 6 7 California; The Scripps Research Institute; The Burnham human or rat tumor cell lines. Treatment in combination Institute, La Jolla, California; 8AstraZeneca PLC, Waltham, Massachusetts; 9Metabolex, Inc., Hayward, California; and with docetaxel significantly enhanced both the inhibition 10Gilead Sciences, Inc., Foster City, California of primary tumor growth and the survival of the tumor- bearing mice compared with administration of either agent alone. In summary, SU14813inhibited target RTK Abstract activity in vivo in association with reduction in angio- Receptor tyrosine kinases (RTK), such as vascular endo- genesis, target RTK-mediated proliferation, and survival thelial growth factor receptor (VEGFR), platelet-derived of tumor cells, leading to broad and potent antitumor growth factor receptor (PDGFR), stem cell factor receptor efficacy.
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